<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        p.center{text-align: center}

    </style>
</head>
<body>
    <h1>这个标题不受影响</h1>
    <p class="center">这个标题居中对齐</p>
</body>
</html>